chore: cherry-pick adc8f05aa3ab from chromium

patches/chromium/.patches

@@ -100,3 +100,4 @@ move_readablestream_requests_onto_the_stack_before_iteration.patch
 streams_convert_state_dchecks_to_checks.patch
 audiocontext_haspendingactivity_unless_it_s_closed.patch
 protect_automatic_pull_handlers_with_mutex.patch
+cherry-pick-adc8f05aa3ab.patch

patches/chromium/cherry-pick-adc8f05aa3ab.patch

@@ -0,0 +1,51 @@
+From adc8f05aa3abbde50a7b9171c7311aba08c07b00 Mon Sep 17 00:00:00 2001
+From: Alex Turner <alexmt@chromium.org>
+Date: Fri, 20 Sep 2019 20:21:41 +0000
+Subject: [PATCH] Handle ERR_CACHE_RACE in DoDoneHeadersAddToEntryComplete
+
+Crashes have been observed in the wild that may be due to
+ERR_CACHE_RACE being sent to STATE_DONE_HEADERS_ADD_TO_ENTRY_COMPLETE.
+These crashes, however, cannot be reproduced and code investigation
+does not suggest how they might happen. If the crashes stop occurring
+following this change, we will be sure that this is the cause and will
+perform more analysis based on that understanding.
+
+Bug: 959194
+Change-Id: I01649ee31024b598e41c0beda7c7ed54980cb133
+Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1814843
+Commit-Queue: Alex Turner <alexmt@chromium.org>
+Reviewed-by: Shivani Sharma <shivanisha@chromium.org>
+Cr-Commit-Position: refs/heads/master@{#698597}
+---
+ net/http/http_cache_transaction.cc | 10 +++++++++-
+ 1 file changed, 9 insertions(+), 1 deletion(-)
+
+diff --git a/net/http/http_cache_transaction.cc b/net/http/http_cache_transaction.cc
+index 6f2577de617ec..bc1193f4b7d43 100644
+--- a/net/http/http_cache_transaction.cc
++++ b/net/http/http_cache_transaction.cc
+@@ -1430,8 +1430,15 @@ int HttpCache::Transaction::DoDoneHeadersAddToEntryComplete(int result) {
+   DCHECK(response_.headers);
+
+   cache_pending_ = false;
+-  entry_ = new_entry_;
+   done_headers_create_new_entry_ = false;
++
++  // Speculative fix for rare crash. crbug.com/959194
++  if (result == ERR_CACHE_RACE) {
++    TransitionToState(STATE_HEADERS_PHASE_CANNOT_PROCEED);
++    return OK;
++  }
++
++  entry_ = new_entry_;
+   DCHECK_NE(response_.headers->response_code(), 304);
+   DCHECK(cache_->CanTransactionWriteResponseHeaders(
+       entry_, this, partial_ != nullptr, false));
+@@ -2078,6 +2085,7 @@ int HttpCache::Transaction::DoHeadersPhaseCannotProceed(int result) {
+   SetRequest(net_log_);
+
+   entry_ = nullptr;
++  new_entry_ = nullptr;
+
+   // Bypass the cache for timeout scenario.
+   if (result == ERR_CACHE_LOCK_TIMEOUT)